90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
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// Copyright 2012 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DNS_DNS_CONFIG_SERVICE_WIN_H_
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#define NET_DNS_DNS_CONFIG_SERVICE_WIN_H_
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// The sole purpose of dns_config_service_win.h is for unittests so we just
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// include these headers here.
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#include <winsock2.h>
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#include <iphlpapi.h>
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#include <iptypes.h>
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#include <memory>
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#include <string>
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#include <vector>
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#include "base/memory/free_deleter.h"
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#include "base/strings/string_piece_forward.h"
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#include "net/base/net_export.h"
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#include "net/dns/dns_config_service.h"
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#include "net/dns/public/win_dns_system_settings.h"
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// The general effort of DnsConfigServiceWin is to configure |nameservers| and
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// |search| in DnsConfig. The settings are stored in the Windows registry, but
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// to simplify the task we use the IP Helper API wherever possible. That API
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// yields the complete and ordered |nameservers|, but to determine |search| we
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// need to use the registry. On Windows 7, WMI does return the correct |search|
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// but on earlier versions it is insufficient.
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//
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// Experimental evaluation of Windows behavior suggests that domain parsing is
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// naive. Domain suffixes in |search| are not validated until they are appended
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// to the resolved name. We attempt to replicate this behavior.
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namespace net {
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namespace internal {
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// Converts a UTF-16 domain name to ASCII, possibly using punycode.
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// Returns empty string on failure.
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std::string NET_EXPORT_PRIVATE ParseDomainASCII(base::WStringPiece widestr);
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// Parses |value| as search list (comma-delimited list of domain names) from
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// a registry key and stores it in |out|. Returns empty vector on failure. Empty
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// entries (e.g., "chromium.org,,org") terminate the list. Non-ascii hostnames
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// are converted to punycode.
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std::vector<std::string> NET_EXPORT_PRIVATE
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ParseSearchList(base::WStringPiece value);
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// Fills in |dns_config| from |settings|. Exposed for tests. Returns nullopt if
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// a valid config could not be determined.
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absl::optional<DnsConfig> NET_EXPORT_PRIVATE
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ConvertSettingsToDnsConfig(const WinDnsSystemSettings& settings);
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// Service for reading and watching Windows system DNS settings. This object is
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// not thread-safe and methods may perform blocking I/O so methods must be
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// called on a sequence that allows blocking (i.e. base::MayBlock). It may be
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// constructed on a different sequence than which it's later called on.
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// WatchConfig() must be called prior to ReadConfig().
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// Use DnsConfigService::CreateSystemService to use it outside of tests.
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class NET_EXPORT_PRIVATE DnsConfigServiceWin : public DnsConfigService {
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public:
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DnsConfigServiceWin();
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DnsConfigServiceWin(const DnsConfigServiceWin&) = delete;
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DnsConfigServiceWin& operator=(const DnsConfigServiceWin&) = delete;
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~DnsConfigServiceWin() override;
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private:
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class Watcher;
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class ConfigReader;
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class HostsReader;
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// DnsConfigService:
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void ReadConfigNow() override;
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void ReadHostsNow() override;
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bool StartWatching() override;
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std::unique_ptr<Watcher> watcher_;
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std::unique_ptr<ConfigReader> config_reader_;
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std::unique_ptr<HostsReader> hosts_reader_;
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};
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} // namespace internal
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} // namespace net
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#endif // NET_DNS_DNS_CONFIG_SERVICE_WIN_H_
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